This European Standard defines the specifications and test methods for the construction, safety, rational use of energy and fitness for purpose, environment and classification and marking of gas-fired storage water heaters for domestic hot water uses, hereafter called "appliance". This standard applies to appliances : - of types B11, B11BS, C11, C12, C13, C21, C31, , C32, C33, C42, C43, C51,C52, C53, C62, C63, C72, C73, C81 connected to an individual flue duct, C82 and C83 ; - fitted with atmospheric burners ; - using one or more combustible gases corresponding to the three gas families and the pressures indicated in EN 437 ; - of nominal heat input not exceeding 150 kW (net calorific value) ; - using or not the water condensation heat in the combustion products ; - fitted with electrically operated mechanical flue dampers that are positioned downstream of the heat exchanger and tested as an integral part of the water heater. - appliances whether subject to the water mains pressure or open-circuit. This standard does not contain all the requirements necessary for : - appliances fitted with a fan on the combustion circuit ; - appliances intended to be connected to a mechanical means of evacuating the combustion products ; - appliances which fulfill a dual role of space heating and heating water for domestic hot water use ; - appliances with a combustion products discharge safety device other than that for type B11BS appliances; This standard does not contain all the necessary requirements to make it applicable to appliances with a variable combustion air flow rate.
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